Electric rotating machine

ABSTRACT

A rotating electric machine of the type in which the connection ends of the bars of the commutator are connected by connecting wires to the armature windings. Elements of insulating material are interposed between the connection ends of the commutator bars to preclude contact between the connecting wires.

I United States Patent 1 1 3,590,296

{72] Inventor Rene Durnez 156] R feren e Cited saillt'clwdv UNITED STATES PATENTS [2H P 2,283,808 5/1942 Humphrey 310 235 (221 F'led 2,658,158 11/1953 Bender..... 310/234 'f ""5" P 2,749,460 6/1956 Acton 310/270 Assgnce f age 3,365,600 1/1968 Penn 310 270 3,447,011 5/1969 Amrein. 310/235 [32] 3,471,731 10/1969 Pratt 310/270 [33] France [31 179,481 Primary Examiner-Milton O. Hirshfield Assistant Examiner-R. Skudy Attorney-Irving M. Weiner [541 ELECTRIC T W MACHINE ABSTRACT: A rotating electric machine of the type in which 2 Claims 2 Drawmg Flgs' the connection ends of the bars of the commutator are con- [52] U.S.Cl..... 310/234 nected by connecting wires to the armature windings. Ele- [51] Int. H02k 13/04 ments of insulating material are interposed between the con- [50] Field ofSearch 310/234, nection ends of the commutator bars to preclude Contact 235, 27 0, 237, 233, 236 between the connecting wires.

ELECTRIC ROTATING MACHINE The present invention relates to electric rotating machines provided with a commutator and more particularly to lowpower electric machines in which each bar or segment of the commutator is provided with a portion constituting a hook to which are attached the wire loops issuing from the armature windings of the machine.

It has been found in these types of electric machines that the wires connected to two consecutive bars of the commutator are liable to come in contact with each other during manufacture of the machine and in the course of its subsequent operation owing to for example handling, mechanical vibrations, movements of the wires upon acceleration of the rotor or action of the temperature. This contact between the wires in the region of the bars of the commutator is very harmful when the wires produce an electric contact since the corresponding windings of the armature are short-circuited.

The object of the present invention is to remedy this drawback.

The invention provides an electric machine having a commutator wherein the wires which connect the armature windings to the commutator and are connected to the bars adjacent the commutator are separated by elements of insulating material, said elements being interposed between the connection ends of said bars.

Further features and advantages of the invention will be apparent from the ensuing description with reference to the accompanying drawing.

In the drawing:

FIG. I is a partial perspective view of an armature of an electric machine having a commutator improved in accordance with one embodiment of the invention, and

FIG. 2 is a partial view taken along line 2-2 ofFIG. I.

As can be seen in FIG. 1, which shows only the armature of an electric machine, the coil heads 2 have connection wires 3 which terminate in loops 4. The latter are hooked to end portions constituting books 5 which form part of the conductive bars or segments 6 of the commutator 7 of the machine. The conductive bars 6 are separated by insulating strips 8.

The connection wires issuing from the windings of the armature pass around the shaft 9 of the machine (not seen in FIG. I) and are connected to the corresponding hooks 5 with the suitable angular offset (see FIG. 2).

An insulating washer 10 is combined with the commutator 7. It has on its periphery teeth 11 which constitute separating elements and are introduced respectively between the connection ends of the bars 6 of the commutator. The washer 10 can be of any suitable insulating material and it is keyed or fixed to the shaft 9.

Owing to the washer I0, the wire loops 4 adjacent thereto are held apart in that they are disposed on each side of the respective teeth of the washer.

Note that the invention is particularly effective in machines in which the commutator has a high number of bars or in which there is a large angular offset between the coil heads and their associated commutator bars.

Although a specific embodiment of the invention has been described, many modifications and changes may be made therein without departing from the scope of the invention.

Having now described my invention what I claim and desire to secure by Letters Patent is:

l. A rotating electric machine comprising a shaft, a commutator and an armature mounted on said shaft, said armature having windings and said commutator having commutator bars comprising connection ends, wires connecting said armature windings to respective ones of said connection ends of said bars said connection ends having freely extending extremities projecting in the direction of said armature and, pro vided between succeeding ones of said extremities, a protecting element of an insulating material so as to maintain separated from each other respective ones of said wires connected to said succeeding extremities.

2. A rotating electric machine comprising a shaft, a commutator and an armature mounted on said shaft, said armature having windings and said commutator having commutator bars having connection ends, wires connecting said armature windings to said connection ends of said bars and elements of an insulating material interposed between said connection ends of said bars, wherein said elements are teeth provided on the periphery of an insulating washer which is mounted on said shaft in a position adjacent said commutator. 

1. A rotating electric machine comprising a shaft, a commutator and an armature mounted on said shaft, said armature having windings and said commutator having commutator bars comprising connection ends, wires connecting said armature windings to respective ones of said connection ends of said bars said connection ends having freely extending extremities projecting in the direction of said armature and, provided between succeeding ones of said extremities, a protecting element of an insulating material so as to maintain separated from each other respective ones of said wires connected to said succeeding extremities.
 2. A rotating electric machine comprising a shaft, a commutator and an armature mounted on said shaft, said armature having windings and said commutator having commutator bars having connection ends, wires connecting said armature windings to said connection ends of said bars and elements of an insulating material interposed between said connection ends of said bars, wherein said elements are teeth provided on the periphery of an insulating washer which is mounted on said shaft in a position adjacent said commutator. 